Bump postcss and gulp-autoprefixer

[dependabot]

Bumps postcss to 8.4.21 and updates ancestor dependency gulp-autoprefixer. These dependencies need to be updated together.

Updates postcss from 6.0.23 to 8.4.21

Release notes

Sourced from postcss's releases.

8.4.21

• Fixed Input#error types (by @​hudochenkov).

8.4.20

• Fixed source map generation for childless at-rules like @layer.

8.4.19

• Fixed whitespace preserving after AST transformations (by @​romainmenke).

8.4.18

• Fixed an error on absolute: true with empty sourceContent (by @​KingSora).

8.4.17

• Fixed Node.before() unexpected behavior (by @​romainmenke).
• Added TOC to docs (by @​muddv).

8.4.16

• Fixed Root AST migration.

8.4.15

• Fixed AST normalization after using custom parser with old PostCSS AST.

8.4.14

• Print “old plugin API” warning only if plugin was used (by @​zardoy).

8.4.13

• Fixed append() error after using .parent (by @​thecrypticace).

8.4.12

• Fixed package.funding to have same value between all PostCSS packages.

8.4.11

• Fixed Declaration#raws.value type.

8.4.10

• Fixed package.funding URL format.

8.4.9

• Fixed package.funding (by @​mondeja).

8.4.8

• Fixed end position in empty Custom Properties.

8.4.7

• Fixed Node#warn() type (by @​ybiquitous).
• Fixed comment removal in values after ,.

8.4.6

• Prevented comment removing when it change meaning of CSS.
• Fixed parsing space in last semicolon-less CSS Custom Properties.

... (truncated)

Changelog

Sourced from postcss's changelog.

8.4.21

• Fixed Input#error types (by Aleks Hudochenkov).

8.4.20

• Fixed source map generation for childless at-rules like @layer.

8.4.19

• Fixed whitespace preserving after AST transformations (by Romain Menke).

8.4.18

• Fixed an error on absolute: true with empty sourceContent (by Rene Haas).

8.4.17

• Fixed Node.before() unexpected behavior (by Romain Menke).
• Added TOC to docs (by Mikhail Dedov).

8.4.16

• Fixed Root AST migration.

8.4.15

• Fixed AST normalization after using custom parser with old PostCSS AST.

8.4.14

• Print “old plugin API” warning only if plugin was used (by @​zardoy).

8.4.13

• Fixed append() error after using .parent (by Jordan Pittman).

8.4.12

• Fixed package.funding to have same value between all PostCSS packages.

8.4.11

• Fixed Declaration#raws.value type.

8.4.10

• Fixed package.funding URL format.

8.4.9

• Fixed package.funding (by Álvaro Mondéjar).

8.4.8

• Fixed end position in empty Custom Properties.

8.4.7

• Fixed Node#warn() type (by Masafumi Koba).
• Fixed comment removal in values after ,.

8.4.6

• Prevented comment removing when it change meaning of CSS.
• Fixed parsing space in last semicolon-less CSS Custom Properties.

... (truncated)

Commits

• 32ced0e Release 8.4.21 version
• a936b80 Update dependencies
• c9bd445 Fix types
• 4ad96d1 Merge pull request #1811 from hudochenkov/fix-input-types
• 15f5fad Add types for an Input.error()
• 43bd2df Merge pull request #1808 from hudochenkov/update-syntaxes
• 292b8f0 Add postcss-styled-syntax to list of syntaxes
• 29f5168 Update postcss-html and postcss-markdown repositories
• 1d4c509 Release 8.4.20 version
• 905082a Add Node.js 10 to CI
• Additional commits viewable in compare view

Updates gulp-autoprefixer from 4.1.0 to 8.0.0

Release notes

Sourced from gulp-autoprefixer's releases.

v8.0.0

Breaking

• Require Node.js 12 a953087

Improvements

• Upgrade dependencies a953087

sindresorhus/gulp-autoprefixer@v7.0.1...v8.0.0

v7.0.1

• Make Gulp an optional peer dependency da50fd2

sindresorhus/gulp-autoprefixer@v7.0.0...v7.0.1

v7.0.0

Breaking:

• Require Node.js 8 and Gulp 4 ab49120

sindresorhus/gulp-autoprefixer@v6.1.0...v7.0.0

v6.1.0

• Upgrade dependencies 7b080bf

sindresorhus/gulp-autoprefixer@v6.0.0...v6.1.0

Commits

• ede5a11 8.0.0
• a953087 Require Node.js 12 and upgrade dependencies
• 87ff53d Move to GitHub Actions (#117)
• c5e7214 7.0.1
• da50fd2 Make Gulp an optional peer dependency
• 40fba84 7.0.0
• ab49120 Require Node.js 8 and Gulp 4
• 83cc576 Enable the repo sponsor button
• adec1a7 6.1.0
• 7b080bf Upgrade dependencies
• Additional commits viewable in compare view

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